Wrench extension



FIG. 1 is a front view of a wrench extension showing my new design;

FIG. 2 is a rear view of the wrench extension;

FIG. 3 is a left side view of the wrench extension;

FIG. 4 is a right side view of the wrench extension;

FIG. 5 is a top view of the wrench extension; and,

FIG. 6 is a bottom view of the wrench extension. 

CLAIM The ornamental design for a wrench extension, as shown and described. 